mescc: Mes C Library: Support GNU Awk: Add abtod, implementing strtod.

* include/libmes.h (abtod): Declare.
* lib/mes/abtod.c: New file.
* build-aux/configure-lib.sh (libmes_SOURCES, libc_tcc_SOURCES): Add
it.
* lib/mes/abtol.c: Update.
* lib/stdlib/strtod.c: Use it to implement; move from stub/strtod.
* lib/tests/mes/90-abtod.c: Test it.
* lib/tests/mes/90-abtod.stdout: Baseline.
* build-aux/check-mescc.sh (tests): Run it.

build-aux/check-mescc.sh

@@ -200,6 +200,7 @@ if test -z "$bootstrap"; then
     TESTS="$TESTS
 lib/tests/dirent/90-readdir.c
 lib/tests/io/90-stat.c
+lib/tests/mes/90-abtod.c
 lib/tests/posix/90-execlp.c
 lib/tests/posix/90-unsetenv.c
 lib/tests/signal/90-signal.c
@@ -223,6 +224,7 @@ lib/tests/scaffold/a1-global-no-clobber.c
 fi
 
 XFAIL_TESTS="
+lib/tests/mes/90-abtod.c
 lib/tests/stdio/90-sprintf.c
 lib/tests/stdio/90-sprintf.c
 "
@@ -262,6 +264,7 @@ fi
 
 if test $compiler = gcc; then
     XFAIL_TESTS="$XFAIL_TESTS
+lib/tests/mes/90-abtod.c
 "
 
     if test $mes_cpu = x86; then

build-aux/configure-lib.sh

@@ -86,6 +86,7 @@ lib/linux/lseek.c
     fi
 else
     libmes_SOURCES="$libmes_SOURCES
+lib/mes/abtod.c
 "
 fi
 
@@ -156,6 +157,7 @@ lib/ctype/islower.c
 lib/ctype/isupper.c
 lib/ctype/tolower.c
 lib/ctype/toupper.c
+lib/mes/abtod.c
 lib/mes/search-path.c
 lib/posix/execvp.c
 lib/stdio/fclose.c
@@ -180,6 +182,7 @@ lib/stdio/vsprintf.c
 lib/stdio/vsscanf.c
 lib/stdlib/calloc.c
 lib/stdlib/qsort.c
+lib/stdlib/strtod.c
 lib/stdlib/strtof.c
 lib/stdlib/strtol.c
 lib/stdlib/strtold.c
@@ -199,7 +202,6 @@ lib/stub/ldexp.c
 lib/stub/mprotect.c
 lib/stub/localtime.c
 lib/stub/sigemptyset.c
-lib/stub/strtod.c
 lib/$mes_cpu-mes-$compiler/setjmp.c
 "
 

include/mes/lib.h

@@ -28,6 +28,7 @@ void __ungetc_init ();
 void __ungetc_clear (int filedes);
 void __ungetc_set (int filedes, int c);
 int __ungetc_p (int filedes);
+double abtod (char const **p, int base);
 long abtol (char const **p, int base);
 char *itoa (int number);
 char *ltoa (long number);

lib/mes/abtod.c

@@ -0,0 +1,53 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2016,2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <mes/lib.h>
+
+double
+abtod (char const **p, int base)
+{
+  char const *s = *p;
+  double d = 0;
+  int sign_p = 0;
+  if (!base)
+    base = 10;
+  double dbase = base;
+  long i = abtol (&s, base);
+  long f = 0;
+  long e = 0;
+  if (*s == '.')
+    {
+      s++;
+      f = abtol (&s, base);
+    }
+  if (*s == 'e')
+    {
+      s++;
+      e = abtol (&s, base);
+    }
+  d = i + f / dbase;
+  if (e < 0)
+    while (e++)
+      d = d / dbase;
+  while (e--)
+    d = d * dbase;
+  *p = s;
+  return sign_p ? -d : d;
+}

lib/mes/abtol.c

@@ -26,12 +26,16 @@ abtol (char const **p, int base)
 {
   char const *s = *p;
   int i = 0;
-  int sign = 1;
+  int sign_p = 0;
   if (!base)
     base = 10;
+  while (isspace (*s))
+    s++;
+  if (*s && *s == '+')
+    s++;
   if (*s && *s == '-')
     {
-      sign = -1;
+      sign_p = 1;
       s++;
     }
   while (isnumber (*s, base))
@@ -42,5 +46,5 @@ abtol (char const **p, int base)
       s++;
     }
   *p = s;
-  return i * sign;
+  return sign_p ? -i : i;
 }

lib/stdlib/strtod.c

@@ -0,0 +1,41 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <mes/lib.h>
+#include <stdlib.h>
+#include <string.h>
+
+double
+strtod (char const *string, char **tailptr)
+{
+  int base = 10;
+  if (!strncmp (string, "0x", 2))
+    {
+      string += 2;
+      base = 16;
+    }
+  if (tailptr)
+    {
+      *tailptr = (char *) string;
+      return abtod ((char const **) tailptr, base);
+    }
+  char **p = (char **) &string;
+  return abtod ((char const **) p, base);
+}

lib/tests/mes/90-abtod.c

@@ -1,6 +1,6 @@
 /* -*-comment-start: "//";comment-end:""-*-
  * GNU Mes --- Maxwell Equations of Software
- * Copyright © 2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ * Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
  *
  * This file is part of GNU Mes.
  *
@@ -21,12 +21,13 @@
 #include <mes/lib.h>
 #include <stdlib.h>
 
-double
-strtod (char const *string, char **tailptr)
+int
+main ()
 {
-  static int stub = 0;
-  if (__mes_debug () && !stub)
-    eputs ("strtod stub\n");
-  stub = 1;
+  char *s = "1.2e3";
+  char *p = s;
+  double d = abtod (&p, 0);
+  printf ("%f\n", d);
+
   return 0;
 }

lib/tests/mes/90-abtod.stdout

@@ -0,0 +1 @@
+1200.000000